The major changes compared to the IMP 3.x versions are: * Much improved message format support through Horde's rewritten MIME system * Many, many additional and improved mime viewers for attachments * Encrypting, signing, decrypting and verifying of signed and encrypted messages (PGP/GPG and S/MIME) * Message filters moved to a separate application (Ingo) to support more filter backends and a more robust/comprehensive/easy-to-use UI * Full charset support in folders, mailbox, message and compose views * Mail folders in the left menu * Experimental support for virtual folders * Preview of attachments in compose view * Send attachments as links * Option to not save attachments with sent mail * Navigation through message and mailbox views with arrow keys * View all messages of a thread * HTML message composition with a cross-browser WYSIWIG editor * Fetching mails from other email accounts to view with IMP * Message previews in mailbox view * Prevent message loss during compositon due to session timeouts * Management of shared IMAP folders * Priority settings for composed messages * User management for supported IMAP servers * Integrated quota support * Support for mailing list headers * Ability to forward multiple messages at once * Downloading of all attachments from a message as a single ZIP file * Stripping individual attachments from messages * Alias and "tied to" addresses in user identities * Authentication with Horde credentials * Graphical emoticons and country flags in message view * Various caching improvements to drastically minimize duplicate IMAP server->web server traffic
Uffff, I tryed, but too hard.